Various Paleo and Neolithic stone tools. Including four north Bulgarian stone axe-heads (4-7.5 cm; obsidian triangular point, Monte Grosso, Corsica length 6 cm; north African flint hand-axe length 8 cm; Laos hardstone axe-head (l7 cm; Normandy flint core; and three flint blades, Paris basin (7 cm.